Best Undercoatings

We’ve analyzed 326 reviews of undercoatings, and compared them side-by-side.

Below you will find a comparison chart(click on the product name to read full review).


Product3M 03584Rust-Oleum 248657Evercoat 1348
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Do you live near the ocean or in areas that have too much snow? If you do, then you know that your vehicle is more prone to rust compared to vehicles in other regions. Considering that your car is a valuable asset, you need to take care of it in the best way possible, especially if you reside in areas that have a lot of snow. One of the most effective ways to protect your vehicle is applying the best undercoating. Finding the right undercoating, however, might prove a daunting task. As such, we have compiled a list of 10 of the best undercoating that you could find in the market today.

Things You Need To Keep In Mind

When you venture into the market looking for the best undercoating, you have to keep a couple of things in mind. It is important that you find an undercoating that suits you best. With many undercoating brands competing for your attention, you will need to find the one that provides adequate protection to your car. Here are some of the most important things to keep in mind when shopping for an undercoating.

  • Is undercoating your vehicle a good idea or not?
  • What are some of the advantages and disadvantages of undercoating?
  • What are some of the methods of undercoating?
  • Which is the best procedure for undercoating your vehicle?
  • How much will it cost to undercoat your vehicle?
  • On which parts of your vehicle is undercoating applied?

Product Reviews

3M 03584 Professional Grade Rubberized Undercoating – Best No-run Formula

3M 03584If you are looking for an undercoating to apply on your vehicle, you might consider settling with the 3M 03584 Professional Grade Rubberized Undercoating. This undercoating can be used on trucks, cars, and recreational vehicles. The product’s value matches its price, which means you can rely on it to protect your car.

Additionally, it only needs to be applied once to protect your car. The black protective coating is effective in protecting your vehicle from rust. Moreover, it has sound-deadening capabilities to minimize the noise you hear as you drive. Another impressive aspect about it is that it has a no-run formula to give you a cleaner application.

The undercoating’s only downside is that it cannot retain the black color once it is exposed to sunlight.

  • It can be applied to a variety of vehicles
  • For its quality, it is fairly priced
  • The undercoating is effective in preventing corrosion
  • It only needs one application to work
  • It tends to bleach when exposed to sunlight

Rust-Oleum 248657 – Best Spray-can Undercoating

Rust-Oleum 248657This black protective coating is among the easiest to use. After applying the well-priced product on your car, you can rest assured that your vehicle’s underside will be safe from moisture and corrosion. This means that living near the ocean will not bother you again.

Interestingly, you can use it on trailers, trucks, and cars. To apply it, hold it 12 to 16 inches from the surface and move your hand back and forth in steady movements. The 248657 is also rubberized and paintable, and you can trust it to prevent any rust on your vehicle.

A major drawback about this undercoating is that it will not protect your car’s underbody if you fail to apply it twice. You may also need to wait longer before it dries.

  • It is well-priced
  • It is lightweight
  • It protects against rust
  • It can be applied on a variety of cars
  • It needs two applications to work effectively
  • It takes relatively long to dry

Evercoat 1348 Low VOC Premium Rubberized Undercoating – Best for DIY projects

Evercoat 1348If you live near the ocean and looking to get a product to protect the underbody of your car from rusting, the Evercoat 1348 could be right for you. Evercoat 1348 is an effective rubberized undercoating guaranteed to protect your car from corrosion.

You can also rely on it for used cars because it works well on bare metal and surfaces that had been painted before alike. Interestingly, it is also VOC compliant and paintable. When it is applied, this coating delivers a sturdy, pliable surface that will allow repair and maintenance to be carried out effectively in the future.

The undercoating is mainly meant for DIY projects. Without the help of a professional, however, most people tend to mess such projects up and incurring more costs.

  • It lasts relatively long
  • The undercoating offers protection against rust
  • It is VOC compliant
  • It can be applied to previously painted surfaces
  • If you are applying a big part, you may need to buy more cans
  • It’s slightly heavy

Rust-Oleum Automotive 254864 – Best for Sound Dampening

Rust-Oleum Automotive 254864If you are looking for a professional grade undercoating, you might want to consider the Rust-Oleum Automotive 254864. The 32-Ounce undercoating is ideal for applying on large vehicles. The formula is suitable for wheel wells, underbodies, boat trailers, trunks, and many other vehicles.

Using this undercoating, you no longer have to worry about packing your recreational vehicle near the beach at any time of the year. Moreover, the 254864 has sound-deadening qualities, so you can enjoy driving silently. This product features a rubberized coating, and it is paintable. You also don’t have to worry about waiting long for it to dry because it dries up soon after application.

It is hard to apply the undercoating without using protective gear because of the fumes it emits. This can be very irritating.

  • It has excellent sound dampening attributes
  • It is ideal for preventing rust
  • It dries quickly
  • It includes application instructions
  • It is slightly heavy
  • It tends to mess up the floor

Dynatex 52175 Rubberized Undercoating Spray – Best Undercoating For the Price

Dynatex 52175If you are looking for an affordable undercoating, you might consider getting yourself the Dynatex 52175 Rubberized Undercoating Spray. The 16 oz. aerosol can will effectively protect your vehicle from rust and corrosion. It is also made with a rubberized undercoating that delivers a tough, durable, and flexible protection.

Moreover, it delivers optimal thickness that is necessary for protecting your vehicle. Once it is applied, it also reduces the road noise, delivering a comfortable cruising experience. Besides its affordability, it is VOC compliant.

Sadly, this undercoating has strict storage requirements. You should store it in cool, dry conditions in unopened containers.

  • It is economically priced
  • It delivers a long-lasting rust and corrosion protection
  • The undercoating is easy to apply
  • It has great sound deadening capabilities
  • It runs when you spray it

Seymour 20-046 Automotive Undercoating – Best Environmental-Friendly Undercoating

Seymour 20-046The next item on our review is the Seymour 20-046 Automotive undercoating. Excellent work has been put into the production of this product to ensure that it offers the underside of your car protection from rusting. The product also seals out fumes, dust, road chemicals, and water.

Moreover, Seymour 20-046 Automotive is environment-friendly. It does not include mercury, cadmium, lead, chlorinated solvents, or chromates. Moreover, it is VOC compliant, meaning that you don’t have to worry about your health when using it. Additionally, the automobile undercoating delivers sound dampening qualities.

Unfortunately, it is also one of the heaviest spray paint undercoating that you can find.

  • It is environment-friendly
  • It has sound deadening qualities
  • It offers excellent rust protection
  • It is quite flexible
  • It is heavier compared to another spray-can undercoating

Penray 4424 Rubberized Undercoat – Best Quick Drying Aerosol Undercoating

Penray 4424If you have not found an undercoating to use on the underbody of your vehicle, try out the Penray 4424 Rubberized Undercoat. This 16-ounce coating dries up quickly after application and maintains its black color. Interestingly, it is also waterproof and rubberized to offer the best protection against corrosion.

Applying this undercoating ensures that your vehicle is safe from extreme cold and heat, salt, fumes, and dust. This undercoating has no bleed-through. It is also ideal for minimizing road noise, and it can also be applied on wheel wells, the undercarriage, and frame of your vehicle. It is also versatile since it allows you to use it in coating gutters and minor roof repairs.

A downside to this coating is that you will need to apply it a couple of times in order to be effective. You might need to get more of it.

  • It dries quickly
  • It is quite versatile
  • It is waterproof
  • It has noise deadening qualities
  • You need to apply multiple layers for the best results

3M 08881 – Best Undercarriage Coating

3M 08881This undercoating protects your vehicle’s undercarriage from the debris on the road. The aerosol undercoating comes in two forms: paintable and non-paintable. However, once applied, you should be sure that your vehicle’s metal will have a smooth texture.

This undercoating is also versatile, and you can apply it to recreational vehicles, cars, and trucks. One impressive feature about this aerosol undercoating is that it covers repair and welding marks on your vehicle. This product features a rubberized formula, and it offers sound dampening capabilities.

A major issue with this undercoating is that it does not maintain its color when exposed to the sun.

  • Versatility
  • Fair price
  • It protects a vehicle’s underside from corrosion and abrasion
  • It has noise dampening qualities
  • It fades when exposed to the sun
  • The valve does not work so well
  • It takes longer to dry
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STA-BIL Heavy Duty Rust and Corrosion Inhibitor – Best Long-lasting Undercoating

STA-BIL Heavy DutyIf you are in pursuit of a versatile undercoating to protect your vehicle from rust and corrosion, the STA-BIL Heavy Duty Rust and Corrosion Inhibitor could do you good. Interestingly, you can also use it on other equipment in your homes such as chainsaws and motorcycles. You can also apply it on painted surfaces, and it will function effectively.

One of the best qualities about this undercoating is its longevity, and it is not affected by different weather conditions. It is also waterproof to protect your vehicle from corrosions caused by water. What’s more, the undercoating lubricates and penetrates, enabling you to use it on moving parts to prevent squeaking and improve their operation.

You, however, need to reapply it sooner than most of the other competing undercoating.

  • It is a multi-purpose product
  • It lubricates and penetrates moving parts
  • It is water resistant
  • The undercoating protects your car against rust and corrosion
  • Its application instructions are not that clear

Rusfre RUS-1020F6 Automotive Spray – Best Spray-gun Undercoating

Rusfre RUS-1020F6This product has been manufactured with bound fibers that help create a strong bond. This bond is what enhances the undercoating’s rust-preventive qualities. It also ensures that the coating is flexible enough to avoid chipping, peeling, or cracking.

Interestingly, this 1-gallon undercoating is free from asbestos. It can be applied either by spraying or using a brush. Additionally, it has sound dampening qualities and can be used for a wide array of operations besides protecting the underside of your vehicle.

A major drawback with this product is that it still leaves a strong smell on your car hours after you apply it.

  • It dissolves well
  • It works excellently
  • The undercoating offers excellent rust protection
  • It takes a long time to cure
  • The undercoating falls in the higher price range

More things to consider before buying an undercoating

Ease of application

When you venture into the market to get yourself the best undercoating, you have to keep in mind its ease of application. This also means that you have to consider how long the undercoating will take to dry up after application. Moreover, you have to know the steps of its application to get the undercoating that best suits your needs.

It is common for people not to know how to go about the application process. If this is also the case with you, you might consider seeking a professional. This is because the professional will help you understand more about the best products in the market and advise you on how to apply them.

However, it might do you some good to know that it is much easier to use an undercoating applied using an aerosol compared to those that need to be applied using a brush.

The thickness

Another consideration that you ought to make concerns the thickness of the coating once it has been applied. When you coat your vehicle, you need to apply a product that will deliver a medium thickness to ensure that it will protect your vehicle.

If you apply a thin undercoat, it might fail to protect your vehicle from debris, snow, and salt. On the other hand, applying a coat that is too thick may make repair and maintenance a hard task. What’s more, it may harm the underside of your vehicle.

The consistency

When you are selecting the right undercoating for your vehicle, you need to consider its consistency. We advise getting an undercoating that will dry hard enough to protect your vehicle from the objects that might harm it. You should use a coating that is receptive to change to allow maintenance and repairs.

However, you should not get a coating that is too pliable because it may not protect your vehicle as you desire. Ultimately, the aerosol undercoating works better compared to undercoating that is applied using a brush, an air compressor, or a spray gun respectively.

Types of Undercoating

Below are the different types of undercoating.

Asphalt-based undercoating

When you head into the market, one of the types of undercoating you might find is an asphalt-based undercoating. This is considered the strongest kind, and it is mainly suitable for vehicles that undergo heavy road use. This type of undercoating is also very durable, and it is mostly applied to military and all-terrain vehicles.

Petroleum-based undercoating

The other kind of undercoating available is a petroleum-based undercoating. This type contains oil, and it deflects debris and salt alike. Its resistance to water is also great. However, you may need to replace it once every year. It is mostly applied when you are buying your car, and can only be found through professional providers.

Rubber-based undercoating

The other kind of undercoating is rubber-based. You can buy it when you are getting a new vehicle, and it can be found in paint-on or spray form. Due to its excellent strength, this type of undercoating is meant for vehicles that go through rough terrains.

Water and paraffin-based undercoating

The other kind is water-based undercoating. This type is mostly meant for DIY projects, and you can purchase it from any automobile shop. They are mostly found in aerosol cans, and they are a bit thin, giving them a faster drying time. However, this kind of coating may need to be re-applied sooner than the other coatings.

There is also the paraffin-based undercoating that comprises wax, providing your vehicle with the protection it needs from snow and salt. You can find them in paint-on or spray form, and you have to replace it once every year.

The Advantages and Disadvantages of Undercoating Your Car

Every coating is made differently, and undercoating your vehicle comes with its advantages and disadvantages. Before we get down to the advantages and disadvantages, you have to know that the best time to have an undercoating applied on your car is when you buy it from the dealer. Applying to coat to a used car may not be effective because all you might be doing is covering up the rust, dirt, and debris. This, however, does not mean that you should not apply a coating to a used car. Applying to undercoat helps to protect it from further exposure.

One of the major advantages of applying to undercoat is that it helps to protect your vehicle from rust. This mostly applies to individuals that live near the ocean. This is because an ocean has salt water. When the water evaporates, the air becomes salty and increases the rate of rusting. If your car has dents, the openings may cause the rust to occur much faster, but you can prevent this by applying a coating.

Another advantage to applying an undercoating is that it can act as a sound deadener. This is an impressive aspect because it makes the car quieter as you drive along the road.

On the other hand, there are notable disadvantages to applying an undercoating. The major disadvantages are the high costs you incur on the undercoating process. When you purchase your vehicle, and the car dealer does the coating for you, you should expect to part with a significant amount of money.

Another drawback of applying to undercoat is that the coating puts on extra weight on your vehicle. The additional weight may affect your vehicle’s fuel efficiency.

Steps to applying to undercoat

To protect your vehicle effectively, you will need to follow the steps below. The steps will ensure that your vehicle is protected from rusting, debris, and water on the road.

  1. Ensure to clean the vehicle’s underside with a degreaser
  2. Use a grinder to remove any rust
  3. Any remaining dust should be sanded
  4. Use a clean material to wipe away the dust
  5. Paint the underside and give it some time to dry fully
  6. Apply the first undercoating on the vehicle’s underbody and leave it for about an hour to dry
  7. Apply the second undercoating
  8. Leave the coating to dry through the night


Rust is quite a nuisance when it comes to vehicles, and if you are keen on preserving your vehicle from such, you need to apply the best undercoating. The ten products on this list are some of the best in the market, but the overall winner in this post is the 3M 03584 Professional Grade Rubberized Undercoating. This is an ideal coating that is affordably priced, and you only need to apply a single coat to keep your car protected. Moreover, it has sound-deadening abilities.

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I've been working in professional paint service in Hampton, VA for the last 15 years. So i know a lot about painting and spray painters.With my team we made this site with to help you to understand why some spray painters are better than others, and how to find the best one for your type of job.

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